Hydra littoralis and H. attenuata were labelled with Ca, PO4, or [ H]thymidine, either by exposing them to a medium containing the isotope or by injecting the isotope into their gut cavities. Various portions of labelled and unlabelled hydra were grafted together in diverse combinations, and the rate of transfer of radioactivity to the unlabelled portion was assessed. The relative transfer rate...

Mutant hydra strains showing abnormal development can be isolated through sexual inbreeding of wild hydra. One such mutant strain, called reg-16, regenerates tentacles very poorly following amputation of the head and foot. Tentacle regeneration, however, is significantly enhanced by subdividing the regenerating fragment longitudinally. Lateral tissue implants that induce head formation in wild-...

The annexins are a structurally related family of Ca2+ and phospholipid binding proteins whose function has not been clearly defined. Further investigations of annexin function may be enhanced by studying simpler organisms that express fewer annexin gene products. We previously characterized annexin XII from the freshwater cnidarian Hydra vulgaris (Schlaepfer, D. D., D. A. Fisher, M. E. Brandt,...

for 22 Oct. 2015 The Lernaean Hydra was a mythological creature, which, when one of its many heads was cut off, immediately grew two more. One of the ten labors of Hercules was to slay the Hydra. In order to help Hercules slay a mathematical version of the Hydra, we will introduce transfinite ordinal numbers, to do what Peano arithmetic cannot. Bring swords, helmets and spears, and a willingnes...

The paper describes the approach for modelling and using semantic descriptions of devices in the HYDRA project middleware (“HYDRA: Networked Embedded System Middleware for Heterogeneous Physical Devices in a Distributed Architecture”) funded within the FP6 IST Programme). The concept of semantic device is introduced and the main use cases for semantic device descriptions are presented with a fo...

METHOD MAE MSD RODRIGUEZ ET AL. 655.7 697.8 LEMPITSKY ET AL. 493.4 487.1 ZHANG ET AL. 467.0 498.5 IDREES ET AL. 419.5 541.6 ZHANG ET AL. 377.6 509.1 CCNN 488.67 646.68 HYDRA 2S 333.73 425.26 HYDRA 3S 465.73 371.84 The Hydra model uses a pyramid of input patches cropped from the center of the target patch to provide multiscale information to the network. The counting by regression model with dee...

How did Pluto’s recently discovered minor moons form? Ward and Canup propose an elegant solution in which Nix and Hydra formed in the collision that produced Charon, then were caught into corotation resonances with Charon, and finally were transported to their current location as Charon migrated outwards. We show with numerical integrations that, if Charon’s eccentricity is judiciously chosen, ...

Vulnerability reward programs, a.k.a. bug bounties, are a popular tool that could help prevent software exploits. Today, however, they lack rigorous principles for setting bounty amounts and require high payments to attract economically rational hackers. Rather than claim bounties for serious bugs, hackers often sell or exploit them. We present the Hydra Framework, the first general, principled...

This is a summary of the design ofHydra, a language prototype for Functional Hybrid Modeling. Hydra is used for non-causal modeling specifications, and based on first-class signal relations, complex systems can be composed by components in a functional way. Reactivity is introduced in Hydra to handle event and discontinuity in such hybrid systems. The experience in studying the semantics and im...

The Linked Data Platform (LDP) W3C Recommendation provides a standard protocol and a set of best practices for the development of read-write Linked Data applications based on HTTP access to Web resources that describe their state using the RDF data model. The Hydra Core Vocabulary is an initiative to define a lightweight vocabulary to describe hypermedia-driven Web APIs. By specifying concepts ...